Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Undrawn capital and purchase commitments	$ 158.8ivz_UndrawnCapitalCommitments	$ 152.5ivz_UndrawnCapitalCommitments
Global sales tax reversed	$ 20.7ivz_GlobalSalesTaxReversed

The company's investment may take the form of the general partner or a limited partner, and the entities are structured such that each partner makes capital commitments that may be drawn down over the life of the partnership as investment opportunities are identified.

No definition available.

Name:	ivz_UndrawnCapitalCommitments
Namespace Prefix:	ivz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration